Update notes.txt

notes.txt

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-GOAL: Build RAG system, that take one user input question, and answer the question base on the knowledge base (articles). If the question is not related to the knowledge base, refuse to answer
+GOAL: Build RAG system, that take one user input question, and answer the question base on the knowledge base (articles). If the question is not supported by articles in the knowledge base, refuse to answer
 Test question: file question_answer.csv